The Washer,key, cataloged under National Stock Number 5310-01-443-6341, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastener Technology Corp. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-443-6341 |
| Primary Part Number | FTD7503-6P |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastener Technology Corp |
| Status | ACTIVE |
| Internal Straight Key Width | 0.028 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Material Document and Classification | MIL-S-25043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Material Thickness | 0.028 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN |
| Tapered Key Minor Width | 0.084 INCHES MINIMUM AND 0.089 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 631 OVERALL |
| Hole Diameter | 0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| FTD7503-6P PRIMARY | Fastener Technology Corp (USA) |
| Reference | Meaning |
|---|---|
| L352000301 | 7/2 Vendor item drawing reference Lockheed Martin Librascope Corporation |
NSN 5310-01-443-6341 is a Washer,key, manufactured by Fastener Technology Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-443-6341 has 1 manufacturer part number on file: FTD7503-6P (Fastener Technology Corp).
1 possible match (shared part number, not a government interchangeability claim): 5325-01-553-1551. Verify interchangeability with system specifications before substitution.
Key specifications for FTD7503-6P: Internal Straight Key Width: 0.028 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Material Document and Classification: MIL-S-25043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN. 9 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.